TM 11-6625-3081-232-6. ELECTRONIC STATION CONTROLS AND INDICATORS (cont)2-6TEMPERATURE CONTROLLER UNIT 1A1 (cont)Key1213141516172-4.2Control or IndicatorSOURCE A READYIndicatorSOURCE A DIFFPushbutton Switch/IndicatorSOURCE A ABSPushbutton Switch/IndicatorTEMPERATUREDIFFERENTIAL C-APushbutton Switch/IndicatorTEMPERATUREDIFFERENTIAL B-APushbutton Switch/IndicatorTEMPERATUREDIFFERENTIAL A-AMBPushbutton Switch/IndicatorChange 8FunctionIndicator lights when source A temperature is stableand within 0.02°C of the set absolute or differentialtemperature.Pushbutton switch enables differential temperaturecontrol.Source A temperature is slaved to the ambientsensor temperature.Source A temperature can bepositive or negative in relationship to the ambientsensor temperature.If positive, source A temperature is regulated abovethe ambient temperature by the differential temperatureset by the thumbwheel switches.If negative, source A temperature is regulated belowthe ambient temperature by the differential temperatureset by the thumbwheel switches.Indicator lights to show differential temperaturecontrol is selected.Pushbutton switch enables absolute temperature controlof blackbody connected to source A.Thumbwheel switchsetting will directly determine temperature ofblackbody surface.Indicator lights to show absolute temperature controlis selected.Pushbutton switch selects display to show temperaturedifference between source C and source A.Indicator lights to show temperature difference betweensource C and source A is displayed.Pushbutton switch selects display to show temperaturedifference between source B and source A.Indicator lights to show temperature difference betweensource B and source A is displayed.Pushbutton switch selects display to show temperaturedifference between source A and the ambient sensor.Indicator lights to show temperature difference betweensource A and ambient sensor is displayed.